试题与答案

将乙酰CoA的二个C原子用同位素标记后,经一轮TCA循环后,这两个同位素C原子的去向

题型:填空题

题目:

将乙酰CoA的二个C原子用同位素标记后,经一轮TCA循环后,这两个同位素C原子的去向是(),二轮循环后这两个同位素C原子的去向是()。

答案:

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题型:阅读理解

阅读理解

       Police officers have two main jobs. They help keep people safe and they protect people's property

(财产). They do these things in many ways. They answer calls for help. Some may direct traffic.  Others

try to find out how an accident happened. They try to catch criminals(罪犯). Police officers are the people whom we turn to for help when we feel unsafe.  They are the people we call when we have problems. 

       Being a police officer is not easy. The work is tiring and dangerous. They often fight with some bad

people. Sometimes those bad people carry knives or guns. They can hurt or even kill the police.

       Besides answering calls, the police also help people find out missing persons. They will do all they

can to find the persons.  Also,  when the police see a speeding car,  they will stop it. If they do not,  the

driver of the speeding car may have an accident and hurt other people.  When the police see a person

trying to break into a house, they will stop and question the person. If they do not, the person may steal

things from the house.

       Some police officers patrol (巡逻) in cars or on motorbikes. Some patrol on foot, especially in parks or busy streets. Others even use boats. Most of them have received special training to do with sudden or

special accidents.

       With the police, our lives can keep peaceful and safe.

1. What are the two major duties for police officers according to the passage?        

A. Keep people safe and protect people's property.  

B. Kill bad people and direct traffic.

C. Answer calls and fight with bad people.  

D. Look for missing persons and answer questions.

2. According to the passage, police officers help keep people safe in many ways EXCEPT ____.      

A. answering calls for help                

B. directing traffic  

C. catching criminals                      

D. finding missing dogs

3. The underlined word " speeding"means " _______" in Chinese.       

A. 正常行驶        

B. 超速行驶        

C. 减速行驶      

D. 低速行驶

4. From the passage we know that _________.        

A. being a police officer is very easy      

B. the police's work is not tiring or dangerous

C. we call the police when we feel safe    

D. most of the police have received special training

5. Which one is TRUE according to the passage?       

A. A speeding car can cause an accident.    

B. Most police officers patrol on foot.

C. We can't see police officers in parks.      

D. A person who is trying to open the door will be caught by the police.

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